A.O. Smith BTH 120 - 250 - Manuals

5 DISHWASHING MACHINE REQUIREMENT All dishwashing machines meeting the National Sanitation Foundationrequirements are designed to operate with water flow pressures between15 and 25 pounds per square inch. Flow pressures above 25 pounds persquare inch, or below 15 pounds per square inch, will result ...

8 IMPORTANT The vent system must terminate so that proper clearances are maintained as cited in local codes or the latest edition of the National Fuel Gas Code, ANSI Z223.1,7.3.4e and 7.8a,b, as follows: 1. Do not terminate the exhaust vent terminal over public area where condensate or vapor can cau...

10 FIGURE 12 INSTALLATION OF VENT SYSTEM WARNING THE OPTIONAL INTAKE VENTING ARRANGEMENT AND THE EXHAUSTVENTING ARRANGEMENT MUST BE INSTALLED TO RUN DIRECTLY TO THEOUTDOORS AND NOT IN ANY WAY BE CONNECTED TO ANOTHERVENTING SYSTEM (I.E. FURNACE, DRYERS OR SPACE HEATERS). IT ISCRUCIAL THAT THE VENTING...

11 D. Know your own qualifications or those of your contractor. The solvent welding technique of joining PVC, PVC cellular core, ABS or CPVC pipe is a specialized skill just as any other pipe fitting technique. E. Closely supervise the installation and inspect the finished job before start-up. F. Co...

12 tubing must be connected in order for the switch to change the electrical contacts. The controller requires that the electrical contacts on this air flow switch be open before it will allow the blower to come on. BLOCKED OUTLET PROVER SWITCH (SEE FIGURE 13) The Blocked Outlet Prover Switch is set...

13 CONNECTION OF GAS PIPE 1. When connecting gas pipe to unit, apply wrench to flange only. Note: Do not use wrench on gas valve or gas bracket. See Figure 15. 2. PERFORM THE GAS LEAK TEST ANY TIME WORK IS DONE ON A GAS SYSTEM TO AVOID THE POSSIBILITY OF FIRE OR EXPLOSION WITH PROPERTY DAMAGE, PERSO...

14 HEATER WIRING IF ANY OF THE ORIGINAL WIRE AS SUPPLIED WITH THE APPLIANCE MUST BE REPLACED, IT MUST BE REPLACED WITH 105°C WIRE OR ITS EQUIVALENT, EXCEPT IN THE BURNER HOUSING. IN THIS CASE USE 200°C WIRE. THE COMPUTER CONTROL REQUIRES A SOURCE OF STABLE CLEAN ELECTRICITY FOR PROPER OPERATION. INS...

15 OPERATION SEQUENCE OF OPERATION Typical Control/Appliance Operating Sequence 1. When the control is powered, it should first display “0”, then the input line voltage (“120”), the calibration setting (12), then the actual water temperature in the tank. 2. If the control determines that the actual ...

18 ADJUSTMENT PROCEDURE INITIAL START-UP A minimum gas supply pressure of 5.0" W.C. (4.5" on BTH 150 and 199) for natural gas (11.0" W.C. for L.P. Gas) is required before making any adjustment to the gas control pressure regulator Attempts to adjust the regulator during periods of low ga...

19 FOR YOUR SAFETY READ BEFORE OPERATING WARNING: If you do not follow these instructions exactly, a fire or explosion may result causing property damage, personal injury or loss of life.

20 WARNING UNDER NO CIRCUMSTANCES SHOULD THE INPUT EXCEED THE RATE SHOWN ON THE HEATER RATING PLATE. OVERFIRING COULD RESULT IN DAMAGE OR SOOTING OF THE HEATER. CATHODIC PROTECTION CAUTION HYDROGEN GAS CAN BE PRODUCED IN A HOT WATER SYSTEM SERVED BY THIS HEATER THAT HAS NOT BEEN USED FOR A LONG PERI...

22 To inspect or replace an anode: The anodes on this heater are easily accessible from the top of the heater making replacement simple and quick. 1. Turn the heater off per the lighting instructions. Connect a hose to the drain valve . Locate the hose's discharge in an area where hot water will not...

23 ONE TEMPERATURE - ONE HEATER HORIZONTAL STORAGE TANK FORCED CIRCULATION WITH OR WITHOUT BUILDING RECIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED SAFE TEMPERATURE AT FIXTURES. SEE WATER TEMPERATURE CONTROL WARNING ON PAGE 4. IF HIGHER PREHEAT TEMPERATURES ARE NECESSARY TO OBTAIN ADEQUAT...

24 * PIPE RELIEF VALVE TO OPEN DRAIN. N O T E : IF TEMPERED WATER IS RECIRCULATED, RETURN LINE SHOULD BE CONNECTED AT POINT “A”. INSTALL IN ACCORDANCE WITH LOCAL CODES. TWO TEMPERATURE - ONE HEATER HIGH TEMPERATURE WITH OR WITHOUT BUILDING RECIRCULATION DANGER TEMPERATURE SETTING SHOULD NOT EXCEED S...

28 MANIFOLD KITS Precision cut type “L” all copper A.O. Smith manifold kits assure water flow balance of all units. Without this balance, the full water heating and storage potential of the system cannot be achieved. Plus, the units with the higher water flow may have a shortened life. Unions shown ...

29 CHECKLIST AND SERVICE INFORMATION IMPORTANT The installer may be able to observe and correct certain problems which might arise when the unit is put into operation or when it is re-fired after a prolonged shutdown. HOWEVER, it is recommended that only qualified servicemen, using appropriate test ...

31 Model BTH Limited Warranty A. O. Smith Corporation, the warrantor, extends the following LIMITED WARRANTY to the owner of this water heater. 1. THE TANK If the glass-lined tank in this water heater shall prove upon examination by the warrantor to have leaked due to natural corrosion from potable ...